Robert brown



(No Model R. BROWN. DANDY ROLL FOR PAPER MAKING MACHINES.

No. 407,992. Patented July 30 1889;

Willa/6666' fnvanior Roefi Brown UNITED STATES PATENT OFFICE.

ROBERT BROWN, OF PENIOUIOK, COUNTY OF MID-LOTHIAN, SCOTLAND, ASSIGNOR OFONE-HALF TO GEORGE DINWVOODIE, OF NEWV YORK, N. Y.

DANDY-ROLL FOR PAPER-MAKING MACHINES.

SPECIFICATION formingpart of Letters Patent 'No. 407,992, dated July30,1889.

Application filed August 13, 1888 Serial No. 282,563. (No model.)Patented in England May 4, 1887, No.6,563.

To 6066 whmn it may concern:

Be it known that I, ROBERT BROWN, a subject of the Queen of GreatBritain and Ireland, and a resident of Penicuick, county of Mid-L-thian, Scotland, have invented Improvements in Dandy-Rolls forPaper-Making Machines, (for which I have obtained Letters Patent inGreat Britain, No. 6,563, dated May at, 1887,) of which the following isa specification.

My invention has reference to and comprises improvements in theconstruction of dandy-rolls of paper-making machines that is, rolls formaking the longitudinal and transverse lines or water lines or marks inthe purpose of making a more uniform and laid line, of equalizing thecolor of the paper on both sides, and allowing the machine to be drivenat a higher speed than heretofore.

In the accompanying drawings, Figure 1 is a longitudinal view ofadandy-roll constructed according to my invention. Parts of the rollshave been broken away to illustrate their construction more effectually.Fig. 2 is an end of the same.

The frame B of the roll may be constructed in any usual manner, and uponthis frame I first secure a cover A of woven wire. Upon this woven wireis then wound around spirally or laid wire 0, which is secured to thewoven cover at its end by soldering or otherwise. Over this spiral wireare secured linemark wires D longitudinally of the axis of the roll.These wires D may be secured to the spiral wires by means of solder. Itwill thus be seen that whereas the ordinary roll has only one cover myimproved roll has a woven cover placed on it first. A wire is then runover this woven cover, and the line-marks secured 011 the top of thelaid wire. The laid marks there run longitudinally of the machineinstead of across, as is the case with ordinary laid rolls. The underwoven cover is so woven or so laid upon the roll as to allow 45 thereonthe reverse way of the ordinary woven wire, or it would be impossible torun laid-lined paper, with the object and forthe line-wires around thebody or frame with an ordinary woven wire.

' The advantages to be'derived from the above are as follows: It makesamore distinct laid mark, and the laid is more equal on both sides of thesheet. It also aids materially in keeping the color equal on both sidesof the sheet, because the woven cover, which is underneath, keeps thewater on the paper, and therefore does not allow the fiber to be openedup so much. The paper-machine can be worked at a higher rate of speed,as the woven part of the roll, which keeps the water more on the paper,prevents its lifting the fiber. The woven cover also prevents the liquidmaterial or stuff from getting into the inside of the roll, (whichhappens in the case of the ordinary roll,) and thus saves the time andthe paper which is lost while cleaning the ordinary roll.

It is evident that my arrangementof wires for producing the laid andline marks can be easily applied to the laid cover on rolls at presentin use. In order to produce laid-line writing papers, the wires aresoldered on about a quarter of an inch apart, or whatever distance isrequired for the laid-line mark on the paper. I use either copper orbrass wires for my dandy-roll.

I claim as my invention- 1. A dandy-roll having a woven-wire cover overthe frame and laid wires on this woven cover. a

2. A dandy-roll having a woven cover on So the frame, a wire woundspirally on the woven cover, and wires running longitudinally of theroll, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two sub- 85 scribing witnesses.

ROBERT BROWN.

Witnesses:

' GEo. MACKAY.' 3i Ifoward Place, Edinburgh, Scotland.

NEIL BROWNLEE, 8 York Buildings, Edinburgh.

